Abstract
The strain space multiple mechanism model, which was originally developed for the cyclic behavior of granular materials such as sand, is adapted to idealize the stress–strain behavior of clay under monotonic and cyclic loads. Compared to the conventional elasto-plastic models of the Cam-clay type, advantages of the proposed model include (1) the arbitrary initial K0 state can be analyzed by static gravity analysis, (2) the stress-induced anisotropy (i.e., the effect of initial shear) in the steady (critical) state can be analyzed based on Shibata’s dilatancy model (Ann Disaster Prev Res Inst Kyoto Univ 6:128–134, 1963), (3) over-consolidated clay can be analyzed by defining the dilatancy at the steady state based on the over-consolidation ratio, and (4) the strain-rate effects for monotonic and cyclic shears can be analyzed based on the Isotach/TESRA model proposed by Tatsuoka et al. (Soils Found 42(2):103–129, 2002) in a strain rate ranging from zero to infinity as well as by the conventional strain-rate effects of the secondary consolidation (creep) type. Simulations of the drained/undrained behaviors of clay under monotonic and cyclic loadings are used to demonstrate the performance of the proposed model.
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References
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Acknowledgements
The author gratefully acknowledges Professor H. Ohta and Professor A. Iizuka for use of the computer code DACSAR to conduct simulations based on the Sekiguchi-Ohta model (1997).
This paper is a compilation of the results of the collective efforts of the working group of the FLIP consortium to develop a new model of clayey materials within the framework of the strain space multiple mechanism model. The working group consists of the following members: Susumu Iai, Tetsuo Tobita, Kyohei Ueda, Kengo Kusunoki, Kunihiro Yamaguchi, Yasutaka Kimura, Sho Mizuno, Masaya Ishikawa, Akinori Suzuki, Takashi Nakama, Hosono Atsushi, Soichi Tashiro, Osamu Ozutsumi, Kazuki Uemura, Keisuke Kitade, Naoki Orai, Shingo Mihira, Takeko Mikami, Junichi Hyodo, Koji Ichii, Eiji Kohama, and Yousuke Ohya. As the coordinator of the working group, the author gratefully acknowledges the contributions of the group’s members.
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Nakahara, T., Ueda, K., Iai, S. (2018). Modelling of Cohesive Soils: Soil Element Behaviors. In: Iai, S. (eds) Developments in Earthquake Geotechnics. Geotechnical, Geological and Earthquake Engineering, vol 43. Springer, Cham. https://doi.org/10.1007/978-3-319-62069-5_15
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DOI: https://doi.org/10.1007/978-3-319-62069-5_15
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